[Freesurfer] longitudinal analysis – Is correcting the Base enough?

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Dear FreeSurfer Team,

I am working with a longitudinal design (before and after treatment), and based on the website's recommendation ( https://secure-web.cisco.com/1zrVKA2yLWZKJu8t_xqtLsDY49D7WzDkL9DDKJIkf-aD-ta...) editing the Base could be enough for this.

If I understand this right, I should generate the Base image (without editing the two Cross images) and then edit the Base only. After that, I could create the two longitudinal runs (Long) without editing them as well.

Did I get this right? This could save a huge amount of time since I should edit one image (Base) instead of two (Cross images). I am using Freesurefer 7.1.1.

Thank you for your answer! I greatly appreciate it.

All the best, Eszter Boros